Locomotive boiler



37521320 31923. 7' S. HASEGAWA ET AL.

LOCOMOTIVE BOILER.

FILED SEPT- 12, {9H3- Patented Mar. 2Q, 1923.

barma rarest LOGOBIOTIVE BOILER.

Application filed September T 0 aZZ w from it may concern Be it known that Snico Hesnoawa and TAKASI-II Inner, citizens of Japan, residing at No. 5075 Tennozi, Roirumantai-cho, Minami-ku, @saka, Japan, and No. 162 Kami- Fukushima, Kita-nichome, Kita-ku. Osaka, Japan, respectively, have invented certain new and useful Improvements in a Locomotive Boiler; and they do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in locomotive boilers. The same comprises a boiler that has a steam stop valve or a regulator, not between the saturated steam space and the superheater as usual, but between the superheater and the engine cylinders or other steam consuming means, and also a steam passage extending from between the regulator and the superheater to the saturated steam space in the boiler. When the regulator operates to shut off the flow of steam to the engine cylinders, the said steam passage is automatically opened, so that the steam that has been superheated or generated in the superheater may be sent back to the saturated steam space by a positive steam circulating means. The invention has for its object to superheat or evaporate steam continuously within the superheater, even when steam is not sent to the engine cylinders; and in consequence, the etiiciency of the boiler is much increased, and overheating of the superheater pipes is pre vented.

Referrin to the accompanying drawings, Figure 1 shows a sectional elevation of portion of a locomotive boiler according to our invention.

Figure 2 is a sectional view of a modified boiler construction, embodying our invention.

In Figure 1, A indicates the boiler shell, and B represents the superheater pipes which run through the smoke tube D and connect the saturated steam header C with the superheated steam header E. F is a steam stop valve or regulator. When the valve F is open, steam from the superheated steam header E is let into the engine cylinders (not shown in the drawing) through the pipei' G. H andJ indicate a circulating natra-a ters wh ch ar a r n a, p a

12, 1918. Serial No. 2533,8446.

between the superhea-ter and the regulator F and discharges into the saturated steam space of the boiler shell, and a suitable apparatus I is placed between the inlet or the pipe H and the outlet of the pipe J. The apparatus I is operated automatically when the regulator is closed, and stops when the regulator is open. Einy suitable positive circulating apparatus may be used at l. and for purposes of illustration we have herein shown the device I to consist oi a rotary blower or fluid impeller. L is a steam turbine coupled to the blower I to drive the latter. N is the steam supply pipe for the turbine L, and O is the exhaust steam pipe of the turbine. A suitable automatically acting device K is provided for automatically supplying steam to the turbine L. As herein illustrated, the device K comprises a cylinder Q; and a piston R working in the cylinder Q is coupled directly to the steam regulating valve S. A connecting pipe P establishes communication between the cylinder Q and the steam pipe G. A pipe M connects the saturated steam space of the boiler to the automatically acting valve K, which latter admits steam to the steam pipe N and turbine L, under certain conditions.

When the regulator valve F is open the steam that is generated in the boiler flows from the saturated steam header C through the superheating pi as B, superheated steam header E, and pipe to the engine cylinders or other steam consuming means. In this case, as the pressure in the cylinder Q is equal to that in the boiler, the valve S is not opened, because the area of the piston R is larger than that of the valve S. But when the regulator valve F is closed, the steam pressure in the pipes G and P and that in the cylinder Q drops to such pressure that the steam pressure from pipe M automatically opens the valve S, admitting steam to the pi e N. The steam passing through the pipe into L drives the turbine, which sets the circulating means or blower I in action, causing a positive withdrawal of steam from the superheated steam header E and a discharge of such steam into the saturated steam space of the boiler, and a positive steam circulation through the superheater B. Thus, the superheated steam is carried through a passage outside the boiler, and positively-circulated in a closed circuit through the. saturated steam space of the boiler, saturated steam header, tubes and superheated steam header of the superheater, and their connecting passages. The exhaust steam from the pipe 0 may be sent into the blast or elsewhere for further use.

Figure 2 shows a modification. Similar letters of reference designate corresponding parts in both Figuresv l and 2. When the steam stop valve F is closed the superheated steam header communicates with the saturated steam space of the boiler and at the same time water is allowed to flow into the super-heating tube B, so asto allow the superheater to act as a steam generating tube.

I is a valve placed in the passage connecting the saturated steam header withthe superheated steam header. When the regulator is closed, the valve is to beopened automatically or by hand. X is a valve placed in the pipe connecting the steam header C with the water space of the boiler. It is so located that when the valve is open, water from the boiler flows into the header Y is a valve in the pipe located at the lowest part of the superheated steam header E, which is used to drain off the water in the spaces B, C, and E.

'When the regulator F is closed and the valve 1 is open, the steam begins to circulate in the headers E and C and also in the pipe B; and the said pipe 13 continues to act as a superheater asdescribed. If the valve X is open, in this case a portion of the water in the boiler enters the pipe 13 and the pipe B ceases to serve as a superheater tube, but acts as a steam generating tube. l/Vhen the re ulator F is to be opened again, the valve must first be closed and the valve Y opened to drain oifthe water in the spaces C, B and E.

In the above description, the water supply pipe leading to the space C communicates 'with the water space in the boiler, and the drain pipe which leads from the header E is open outside of the boiler as stated, but the former may draw in water from the outside of the boiler by means of an in jector or by some other feed water supply apparatus, while the latter may eject the drain into the water space of the boiler by means of a similar device.

While,,for purposes of illustration, we

'have herein shown and described our imheader, of valve controlled means for sup-' plying steam from said superheated steam header to steam-consuming means, means connecting the discharge and receiving ends a of said superheater, and means. 1n said connecting means for causing a positive circulation of steam through said superheater when the supply to said steam-consumlng means is shut off.

2. The combination with a boiler having a superheater provided at its receiving end. with a saturated steam header and at its discharge end with a superheated steam header, of means for supplying steam from said superheated steam header to steam-consuming means, means connecting the d1s charge and receiving ends of said superheater and means in such connecting means for causing a positive circulation of steam through said superheater, said last mentioned means being automatically rendered operative when the supply to saidsteam-con suming means is shut off.

3. The combination with a boiler, of a superheater connected to the saturated steam space thereof, a pipe for connecting said superheater to steam-consuming means, a valve in said pipe, means connecting the discharge side of said superheater to the saturated steam space of the boiler, and automatically acting fluid impelling means in such connecting means for causing a positive circulation of steam through said superheater when said valve shuts off steam supplied by the superheater to said steam-consuming means.

a. The combination with a boiler, of a superheater connected to the saturated steam space thereof, a pipe for.'connecting said superheater to steam-consuming means, a valve in said pipe, means connecting the discharge side of said superheater to the saturated steam space of the boiler, and

steam operated fluid impelling means in such connecting means for causing-a positive circulation of steam through said superheater when said valve shuts ofl steam supplied by the superheater to said steam-consuming means.

5. The combination with a locomotive boiler having a saturated steam space and a superheated steam space, of superheated tubes-connected to said steam spaces, means for controlling the flow of steam from said superheated steam space to steam-consuming means, means for conducting fluid in a closed circuit through said superheater tubes and said steam spaces, and means for positively causing'a-circulation of fluid in said closed circuit when said controlling means shuts off the flow of steam to such steam-- consuming means.

6. The combination with a boilerhavin a saturated steam space and a superheatec l steam space, of superheater tubes 1 connected to said steam spaces, means for supplying steam from said superheated steam space to steam-consuming means, means connecting the superheated steam space to the saturated steam space of the boiler for Withdrawing steam from said superheatecsteam space and delivering it to said saturated steam space, automatically acting fluid impelling means in such connecting means for causing a positive circulation of steam through said superheater tubes, and means for automatically supplying steam to operate the impelling means when the supply to said steamconsuming means is shut off.

'7. The combination with a boiler having a saturated steam space and superheated steam space, of superheater tubes connected to said steam spaces, a delivery pipe connecting said superheated steam space to stea1nconsuming means, a valve in said delivery pipe, a circulating steam pipe connecting the superheated steam space to the saturated steam space of the boiler, automatically acting fluid impelling means in said circulating steam pipe, a fluid-pressure pipe extending from said delivery pipe at a point between said valve and said steam-consuming means and auton atically acting means including a fluid-pressure actuated element in said fluid-pressurepipe for efiecting a supply of steam to operate said impelling means When said valve is shut.

In testimony whereof they hereunto affix their signatures.

SEIGO HASEGAWA.

TAKASHI IKEGI. 

